feat: add Ollama proxy timeouts, SSH key migration, polish skills, and demo content

- Update all skill SSH commands from sshpass to key-based auth (~/.ssh/archipelago-deploy)
- Add proxy_connect_timeout 120s to nginx Ollama location blocks
- Add new polish/sweep skills for overnight automation
- Add demo content (documents, photos) for demo stack
- Add .ssh/ to .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo/content/documents/bitcoin-whitepaper-notes.md

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+# Bitcoin Whitepaper Notes
+
+## Key Concepts
+
+### Peer-to-Peer Electronic Cash
+- No trusted third party needed
+- Double-spending solved via proof-of-work
+- Longest chain = truth
+
+### Proof of Work
+- SHA-256 based hashing
+- Difficulty adjusts every 2016 blocks (~2 weeks)
+- Incentive: block reward + transaction fees
+
+### Network
+- Nodes broadcast transactions
+- Miners collect into blocks
+- Blocks are chained via hash references
+
+## My Thoughts
+- The 21M supply cap is genius - digital scarcity
+- Lightning Network solves the scaling concern
+- Self-custody is the whole point
+
+## Reading List
+- [ ] Mastering Bitcoin - Andreas Antonopoulos
+- [ ] The Bitcoin Standard - Saifedean Ammous
+- [ ] Programming Bitcoin - Jimmy Song